EP3966894A1 - Radiator assembly for base station antenna - Google Patents
Radiator assembly for base station antennaInfo
- Publication number
- EP3966894A1 EP3966894A1 EP20723620.9A EP20723620A EP3966894A1 EP 3966894 A1 EP3966894 A1 EP 3966894A1 EP 20723620 A EP20723620 A EP 20723620A EP 3966894 A1 EP3966894 A1 EP 3966894A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- radiator assembly
- base station
- annular element
- station antenna
- antenna according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002184 metal Substances 0.000 claims description 15
- 125000006850 spacer group Chemical group 0.000 claims description 3
- 230000007423 decrease Effects 0.000 claims description 2
- 230000000712 assembly Effects 0.000 description 9
- 238000000429 assembly Methods 0.000 description 9
- 238000004891 communication Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/246—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for base stations
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
- H01Q19/108—Combination of a dipole with a plane reflecting surface
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/061—Two dimensional planar arrays
- H01Q21/062—Two dimensional planar arrays using dipole aerials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/08—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a rectilinear path
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
- H01Q21/26—Turnstile or like antennas comprising arrangements of three or more elongated elements disposed radially and symmetrically in a horizontal plane about a common centre
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/40—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements
- H01Q5/48—Combinations of two or more dipole type antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
- H01Q9/28—Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines
Definitions
- the present invention relates to the technical field of base station antennas, and more particularly to a radiator assembly for a base station antenna.
- the mobile communication network includes a large number of base stations for receiving and transmitting communication signals.
- a single base station antenna may include many radiator assemblies, which may also be referred to as radiating elements or antenna elements.
- the cost of a single radiator assembly has a significant impact on the cost of the entire base station antenna. Miniaturization and cost minimization of radiator assemblies are desirable.
- a 2 GHz frequency band which may cover, for example, a frequency range of 1.69 to 2.69 GHz.
- a 1.4/1.5 GHz frequency band is valuable in International Mobile Telecommunications (IMT) services.
- the 1.4/1.5 GHz band may cover, for example, a frequency range of 1427 to 1518 MHz.
- the object of the present invention is to provide a radiator assembly for a base station antenna, which is compact in structure and broad-band.
- radiator assembly for a base station antenna, having a central axis and two dipoles arranged in a crossed manner, wherein each of the dipoles includes two dipole arms, and each of the dipole arms has a radiating surface having an outer contour
- the radiator assembly comprises an annular element that is electrically conductive, wherein the annular element is mounted above the radiating surfaces, the annular element is configured to be closed circumferentially and has an inner contour which is compliant to an outer contour line for the combination of all four radiating surfaces.
- the compliance is defined as: in a projection along the central axis on a projection plane perpendicular to the central axis, the inner contour of the annular element has a projected inner contour line which surrounds a first area and the outer contours of the radiating surfaces have respective projected outer contour lines, where every two adjacent projected outer contour lines are connected through imaginary connecting lines, where each imaginary connecting line is a chord of a respective imaginary circular arc line, wherein each circular arc line is concentric with the central axis and has a radius that is 1/2 of a maximum radius of the projected outer contour lines of the radiating surfaces, where the projected outer contour lines and the connecting lines together define a maximum outer contour line that is closed circumferentially and that surrounds a second area, wherein the first area and the second area overlap by at least 90%, in other words, an overlapping area of the first area and the second area is 90% or more of a larger area of the first area and the second area.
- the radiating surfaces may be designed at a high center frequency.
- the frequency band is spread to a low frequency end by the resonance of the annular element. Since it is defined in the sense of the present invention that“the annular element has an inner contour which is compliant to an outer contour line of the combination of all four radiating surfaces”, the spreading of the frequency band to the low frequency end and a compact size are achieved advantageously.
- the radiator assembly with the annular element according to the present invention may have a reduced planar size compared to a radiator assembly without such an annular element.
- the terms“above” and“below” can be understood as a relative orientation.
- the expression“the member A is mounted above the member B” means that the member A is mounted farther outward from the reflective plate then the member B, or to say, the member A is disposed at the side of the member B facing away from the reflective member or facing away from the bottom plate of the radiator assembly.
- the radiator assembly is configured to cover not only a frequency band of 1.4/ 1.5 GHz but also a frequency band of 2 GHz.
- the first area and the second area my overlap by at least 95%, for example by at least 98%.
- the overlapping area may be 95% or more of the larger area, and may be for example 98% or more of the larger area.
- the radiating surfaces may be formed on a common printed circuit board.
- the dipole arms may be formed as respective separate members, such as metal members, and may be mounted in a holder.
- each radiating surface may have an outer contour that deviates from a rectangle.
- the projected outer contour lines of the radiating surfaces may have a width that first increases gradually and then decreases gradually.
- the radiating surfaces may be configured to be in the shape of a leaf, an ellipse or a spindle. Perforations may be provided in the radiating surfaces.
- the radiating surfaces may also be constructed to be full-area.
- the printed circuit board may be mounted above a reflective plate, and the radiator assembly may comprise a plurality of spacers through which the annular element is mounted above the printed circuit board at a predetermined distance.
- annular element may have areas that project into the respective gaps.
- the annular element may have a greater width in the areas than in remaining areas.
- the annular element may be made of a sheet metal.
- the annular element may comprise an electrically conductive layer on a printed circuit board.
- the radiator assembly may have a director which may be mounted above the annular element.
- the radiating surfaces may be formed on a common printed circuit board, wherein the director may be supported on the printed circuit board by means of a holder which may have a plurality of support points distributed around the central axis on the printed circuit board.
- the director may be constructed as a prismatic metal plate which may be oriented such that the corners of the metal plate are located in areas of gaps between adjacent radiating surfaces, as viewed along the central axis.
- a pair of the corners of the metal plate may be chamfered.
- an outer contour of the director in a projection along the central axis on the projection plane, has a projected outer contour line which surrounds a third area, where the third area may overlap with a projection of the annular element in the areas of the corners, and at least 90% of the third area may be within a projected inner contour line of the annular element.
- Fig. l is a perspective view of a radiator assembly for a base station antenna according to an embodiment of the present invention.
- Fig. 2 is a side view of the radiator assembly according to Fig. 1.
- Fig. 3 is a top view of the radiator assembly according to Fig. 1.
- Fig. 4 is a perspective view of some components of the radiator assembly according to Fig. 1.
- Fig. 5 is a simplified schematic view that illustrates a projection of the radiating surfaces of the radiator assembly of Fig. 1 along a central axis in a projection plane that is perpendicular to the central axis.
- Fig. 6 is a top view of an annular element according to another embodiment of the present invention.
- Fig. 7 is a perspective view of a radiator assembly for a base station antenna according to another embodiment of the present invention.
- Fig. l is a perspective view of a radiator assembly for a base station antenna according to an embodiment of the present invention
- Fig. 2 is a side view of the radiator assembly according to Fig. 1
- Fig. 3 is a top view of the radiator assembly according to Fig. 1.
- FIGS. 1-3 A small portion of a reflective plate 1 is illustrated in Figs. 1-3.
- An array of radiator assemblies may be mounted on the reflective plate 1, one of which is shown in Figs. 1-3. While the reflective plate 1 is disposed horizontally in FIGS. 1-3 with the radiator assembly extending upwardly therefrom, it will be appreciated that in actual use the reflective plate typically extends substantially in the vertical direction, and the radiator assemblies extend forwardly from the reflective plate 1. Thus, while the discussion below describes the radiator assembly in the orientation shown in FIGS. 1-3, it will be appreciated that the radiator assemblies and reflective plate 1 would typically be rotated approximately 90 degrees when a base station antenna that includes the radiator assemblies is mounted for use.
- the illustrated radiator assembly comprises two dipoles arranged in a crossed manner, where each of the dipoles includes two dipole arms, and each of the dipole arms has a respective radiating surface 12 which may be fed with radio frequency (RF) signals.
- the radiating surfaces 12 are formed on a common printed circuit board 2, although other implementations are possible including, for example, sheet metal radiating surfaces or die cast metal radiating surfaces.
- the radiating surfaces 12 may have respective outer contours that deviate from a rectangle, and surround a central axis 10 of the radiator assembly. There may be a gap between every two adjacent radiating surfaces 12. The gap is an electrical gap, so that a physical gap on the printed circuit board 2, such as a slot cut in the printed circuit board 2, may not be necessary.
- a pair of so- called "feed stalk" printed circuit boards are used to support the printed circuit board 2 forwardly of the reflective plate 1.
- An annular element 3 may be mounted at a predetermined distance above the printed circuit board 2 by a plurality of distributed spacers 11. In some embodiments not shown, one or more additional (e.g., one, two, three, etc.) annular elements may also be mounted either above or below the printed circuit board 2.
- the annular element 3 is configured to be closed circumferentially and has an inner contour 14.
- the annular element 3 may be made of sheet metal.
- the annular element 3 may comprise a printed circuit board that has an electrically conductive layer that is closed circumferentially.
- the annular element 3 may be a two-dimensional or three-dimensional member. The lower end of the operating frequency band of the radiator assembly may be broadened by the resonant effect of the annular element 3. At the same time, the planar dimension of the radiating element may be reduced correspondingly.
- a director 4 may be mounted above the annular element 3.
- the director 4 may be supported on the printed circuit board 2 by means of a holder 13.
- the holder 13 has a plurality of support points distributed around the central axis 10 of the printed circuit board 2.
- the director 4 may be constructed as a metal plate having a prism shape.
- the metal plate may be oriented such that the corners of the prism are located in areas of the gaps between the adjacent radiating surfaces 12, as viewed along the central axis 10. A pair of the corners of the metal plate may be chamfered.
- the outer contour of the director 4 has a projected outer contour line which surrounds a third area.
- the third area may overlap with a projection of the annular element 3 in the areas of the corners, and at least 90% of the third area may be within a projected inner contour line of the annular element 3.
- the director 4 may facilitate achieving a favorable impedance matching in the radiator assembly, and may also assist in controlling the direction of the RF radiation emitted by the radiator assembly and/or may help narrow a beam width of the emitted radiation.
- the reflective plate 1 is described in a horizontal state, and the radiator assembly is above the reflective plate 1.
- the reflective plate 1 may have different orientations, for example, the reflective plate 1 may be oriented obliquely to the sky with respect to a horizontal plane, or may be oriented perpendicular to the horizontal plane, or may be oriented obliquely to the ground with respect to the horizontal plane.
- the absolute orientation of the radiator assembly changes, the relative orientation of the radiator assembly to the reflective plate 1 remains unchanged.
- the terms“above” and“below” can be understood as the relative orientation.
- Fig. 4 is a perspective view of some components of the radiator assembly of Fig. 1, where the director 4, the holder 13 and the annular element 3 are omitted, so that the details of the print circuit board 2 can be illustrated more clearly.
- the outer contours of the radiating surfaces 12 are illustrated schematically with dotted lines.
- Fig. 5 is a schematic view that illustrates a projection of the radiating surfaces 12 along the central axis 10 in a projection plane that is perpendicular to the central axis 10.
- the radiating surfaces 12 have projected outer contour lines 21, 22, 23, 24 with gaps therebetween.
- imaginary connecting lines a, c, e, g are specified in Fig. 5 as connecting lines between adjacent ones of the outer contour lines 21, 22, 23, 24.
- the connecting lines a, c, e, g are chords of imaginary circular arc lines which are concentric with the central axis 10 and have a radius that is 1/2 of a maximum radius R of the outer contour lines 21, 22, 23, 24.
- the outer contour lines 21, 22, 23, 24 and the connecting lines a, c, e, g together define a maximum outer contour line that is closed circumferentially and includes the connecting line a; the outer line segment b of the outer contour line 22 which is located between the connecting lines a, c; the connecting line c; the outer line segment d of the outer contour line 23 which is located between the connecting lines c, e; the connecting line e, the outer line segment f of the outer contour line 24 which is located between the connecting lines e, g; the connecting line g, the outer line segment h of the outer contour line 21 which is located between the connecting lines g, a.
- the inner contour 14 of the annular element 3 may be "compliant" to the outer contour line for the combination of all four radiating surfaces 12.
- the inner contour 14 of the annular element 3 is considered to be “compliant" to the outer contour line for the combination of all four radiating surfaces 12 if, in a projection along the central axis 10 on a projection plane that is perpendicular to the central axis, (1) the inner contour 14 of the annular element 3 has a projected inner contour line which surrounds a first area, (2) the outer contours of the radiating surfaces 12 have respective projected outer contour lines 21, 22, 23, 24 (see Fig.
- each imaginary connecting line a, c, e, g is a chord of a respective imaginary circular arc line, where each circular arc line is concentric with the central axis 10 and each circular arc line has a radius that is 1/2 of a maximum radius R of the projected outer contour lines 21, 22, 23, 24 of the radiating surfaces 12, where the projected outer contour lines 21, 22, 23, 24 and the connecting lines a, c, e, g together define a maximum outer contour line that is closed circumferentially and that surrounds a second area, and (3) the first area and the second area overlap by at least 90%.
- the first area and the second area may overlap by at least 95%. In other embodiments, the overlapping area of the first area and the second area may be within a range of between 92% and 98%.
- Fig. 6 is a top view of an annular element 3 according to another embodiment of the present invention.
- the annular element 3 may have a substantially constant width, as viewed along the central axis 10.
- the annular element 3 may have areas rl, r2, r3, r4 that project into the respective gaps.
- Fig. 7 is a perspective view of a radiator assembly for a base station antenna according to another embodiment of the present invention.
- the radiator assembly of Fig. 7 includes two annular elements 3 mounted above the print circuit board 2, where at least one of the annular elements 3 may have an inner contour that is complaint to the outer contour line of the combination of all four radiating surfaces 12.
- reference to the description of the embodiment of Fig. 1 may be used.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Aerials With Secondary Devices (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Details Of Aerials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201910377664.2A CN111916888A (en) | 2019-05-08 | 2019-05-08 | Radiator assembly for base station antenna |
PCT/US2020/026610 WO2020226795A1 (en) | 2019-05-08 | 2020-04-03 | Radiator assembly for base station antenna |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3966894A1 true EP3966894A1 (en) | 2022-03-16 |
Family
ID=70482797
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20723620.9A Pending EP3966894A1 (en) | 2019-05-08 | 2020-04-03 | Radiator assembly for base station antenna |
Country Status (4)
Country | Link |
---|---|
US (2) | US11177559B2 (en) |
EP (1) | EP3966894A1 (en) |
CN (1) | CN111916888A (en) |
WO (1) | WO2020226795A1 (en) |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4330783A (en) * | 1979-11-23 | 1982-05-18 | Toia Michael J | Coaxially fed dipole antenna |
CN203386887U (en) | 2013-04-25 | 2014-01-08 | 华为技术有限公司 | Antenna oscillator and antenna equipped with same |
US9711871B2 (en) * | 2013-09-11 | 2017-07-18 | Commscope Technologies Llc | High-band radiators with extended-length feed stalks suitable for basestation antennas |
US10333332B1 (en) * | 2015-10-13 | 2019-06-25 | Energous Corporation | Cross-polarized dipole antenna |
EP3168927B1 (en) * | 2015-11-16 | 2022-02-23 | Huawei Technologies Co., Ltd. | Ultra compact ultra broad band dual polarized base station antenna |
US10148015B2 (en) * | 2016-03-14 | 2018-12-04 | Kathrein-Werke Kg | Dipole-shaped antenna element arrangement |
WO2017185184A1 (en) * | 2016-04-27 | 2017-11-02 | Communication Components Antenna Inc. | Dipole antenna array elements for multi-port base station antenna |
DE102016112257A1 (en) | 2016-07-05 | 2018-01-11 | Kathrein-Werke Kg | Antenna arrangement with at least one dipole radiator arrangement |
CN110858679B (en) * | 2018-08-24 | 2024-02-06 | 康普技术有限责任公司 | Multiband base station antenna with broadband decoupling radiating element and related radiating element |
-
2019
- 2019-05-08 CN CN201910377664.2A patent/CN111916888A/en active Pending
-
2020
- 2020-04-03 EP EP20723620.9A patent/EP3966894A1/en active Pending
- 2020-04-03 WO PCT/US2020/026610 patent/WO2020226795A1/en unknown
- 2020-04-28 US US16/860,249 patent/US11177559B2/en active Active
-
2021
- 2021-10-28 US US17/512,836 patent/US20220052443A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
US20200358169A1 (en) | 2020-11-12 |
CN111916888A (en) | 2020-11-10 |
US20220052443A1 (en) | 2022-02-17 |
WO2020226795A1 (en) | 2020-11-12 |
US11177559B2 (en) | 2021-11-16 |
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Owner name: COMMSCOPE TECHNOLOGIES LLC |